|  | 1.5 | Routing and the Different Classes of Routing Protocols
| 1.5.12 | Enabling an IP routing process

The selection of IP as a routed protocol involves the setting of global parameters. Global parameters include selecting a routing protocol, such as RIP or IGRP, and assigning IP network numbers without specifying subnet values. IP Address Configuration You use the ip address command to establish the logical network address of the interface. You use the term ip netmask-format command to specify the format of network masks for the current session. Format options are bit count, dotted-decimal (the default), and hexadecimal. Dynamic Routing Configuration Dynamic routing occurs when routers send periodic routing update messages to each other. Each time such a message is received and it contains new information, the router recalculates the new best route and sends new update information to other routers. By using router configuration commands, a router can adjust to changing network conditions. The table on the left shows the router commands that start routing processes. This table shows which network command is required because it allows the routing process to determine which interfaces will participate in the sending and receiving of routing updates.